Azo dyestuffs



Patented Aug. 30, 1938 UNETED STATES ?A"iE-N'i' OFFECE AZO DYESTUFFS Hans Krzikalia and Hanns Ufer, Ludwigshafenon-the-Rhine, and Bernd lEistert, Mannheim, and Gustav Klaproth, Ludwigshafen-on-the- Rhine, Germany, assignors to General Aniline Works, Erna, New York, N. Y. a corporation of Delaware No Drawing. Application December 18, 1935, Se-

rial No. 55,040. 1934 8 Claims.

the general formula:

R1 XN in which R1 and R2 may be identical or different and may be hydrogen or alkyl, cycloalkyl, hydroxyalkyl or aralkyl radicles or members of a saturated ring system and X is an aliphatic radicle 9 combined with an aromatic nucleus of the dyestuff molecule either directly or by means of a non-basic bridge. As non-basic bridges may be mentioned for example O-, S, CO, SO2, OCO, NHCO, SO2NH and --CONH.

Dyestuffs of the said kind may also be prepared by introducing at least one basic group of the said general formula into a dyestufi which does not yet contain such a basic group combined in the manner described above.

Thus for example a diazotizable amine having the formula:

may be prepared by converting para-nitrophenylethyl alcohol by means of thionyl chloride into para-nitroomegachlorethyl-benzene, reacting the latter with dimethylamine and reducing the 40' nitro group in the resulting amine.

An amine having the formula:

1 CH NHz Germany December 22,

duction of the nitro group, an amine is obtained having the formula:

From 1-brom-2-(diethylamino) ethane and paraacetaminothiophenol, a sulphide is obtained having the formula:

which may be saponified as such to form the amine or may first be oxidized to form the sulphone having the formula:

and then saponified.

The amines prepared according to the above methods or by other known methods and having external basic groups are capable of diazotization in the same way as ordinary aromatic amines and yield azo dyestuffs of the said kind by coupling with compounds which are capable of coupling.

Coupling components having external basic groups are obtained for example by reacting 2- amino-8hydroxynaphthalene-G-sulphonic acid with chloracetyl chloride or a chlorpropionic acid chloride and treating the resulting 2-(chloracylamino)8hydroxynaphthalene6-sulphonic acid with piperidine, dimethylamine or other nitrogen bases which have at least one reactive hydrogen atom. By reacting 2-acetoxy-3-naphthoic acid chloride with N-diethyl-ethylenediamine and then splitting off the acetyl group, a naphthol is obtained having the formula:

Further suitable coupling components are for example the pyrazolones prepared from the above amines by the usual methods, and also the acetoacetyl or benzoyl-acetyl and Z-hydroxy-B-naphthoyl compounds of the said amines. These coupling components may be coupled with any deired diazotized aromatic amines to yield dyestuffs of the said kind.

If the coupling component employed contains an amino group, the monoazo dyestufi prepared may be diazotized and the diazo compound'be coupled with any desired coupling component. Diazo dyestuffs are thus obtained with excellent properties as regards levelling power and fastness.

The introduction of the external basic radicle of the general formula in which X stands for an aliphatic radical into aminoazo or hydroxyazo dyestuifs is eifected in a similar manner.

The azo dyestuifs obtainable according to this invention and having external basic groups are distinguished by an excellent levelling power and for the most part by good to very good fastness to washing and fulling. When the dyestuffs contain groups which are capable of being exchanged by metals, they may be converted in substance or on the fibre into their complex metal compounds.

The following examples will further illustrate how the said invention maybe carried out in practice but the invention is not restricted to these examples. The parts are by weight.

Example 1 270 parts of 4-methyl-3-amino-phenyl-1- omega-(diethyl-amino)-ethyl sulphone having the formula:

35; are dissolvedv in a mixture of 1000 parts of water and 350 parts of concentrated hydrochloric acid and diazotized with a solution 69 parts of sodium nitrite at from 0 to C. The diazo solution is then stirred into a solution of 463 parts of 1- (4'-sulphophenyl) -3-methyl-5-pyrazolone, 210 parts of an about 28 per cent caustic soda solution and 2'70 parts of calcined soda in 2000 parts of water. When the coupling is completed, the resulting dyestufi is precipitated with a common salt solution. It dyes wool yellow shades which are very uniform and of good fastness 'to washing.

A similar procedure is followed when employing' the'coupling components given in the following table instead of l-(4'-sulpho-phenyl)-3 methyl-5-pyrazolone:

. Color of dye- Oouphng component mg on W001 1-(3-chlor-5-sulphophenyl)-3-methyl-5-pyrazolone. Yellow.

2-hydroxynaphthalene-G-sulphonic acid Orange.

2-hydroxynaphthalene-S-sulphonic acid Do.

2-hydroxynaphthalene-3,Mlisulphonic acid v Red.

2-hydroxynaphthalens-6,8-disulphonic acid Orange.

1 benzoylamino 8 hydroxynaphthalene 4,6 disul Bluish red.

phonic acid.

2-amino-8-hydroxynaphthalenc-3,G-disulphonic acid Brown.

The dyestuiis are also suitable for example for dyeing Wool, silk and leather.

Similar dyestuffs are obtained for example by employing para aminophenyl omega-(ethyl- .towashing of the dyestuffs may be further improved by introducing the radicle of dibutyl, dihexyl, dicyclohexyl or dodecyl amine or the piperidino group instead of the diethyl or dimethylamino radicle, the levelling power of the dyestulfs being the same.

Example 2 A diazo solution prepared from 2'70 parts of 4- methyl-3-aminopheny1-1-omega- (diethylamino) ethyl sulphone in the manner described in Example l is stirred into a solution of 5'71 parts of l-(2'-hydroxy-3-carboxy- 5' -sulphophenyl) 3 methyl-5-pyrazolone, 300 parts of an about 28 per cent caustic soda solution and 270 parts of calcined soda in 2500 parts of water. The dyestuif precipitated by acidification dyes wool very uniform yellow shades which are fast to washinganol fulling; it may be treated in substance or on the fibre with agents supplying chromium and then yields redder shades of colour.

Example 3 107 parts of para-toluidine are diazotized in the usual manner and the diazo solution is stirred into a solution, rendered alkaline with sodium carbonate, of 340 parts of 2-(dimethy1-aminoacetyl) -amino 8 hydroxynaphthalen-e 6 sulphonic acid having the formula and the mixture worked up in the usual manner. The dyestuff obtained dyes Wool uniform carmine-red shadesof good fastness to washing.

By starting from the following diazotized compounds dyestuifs having a good levelling power and good fastness to washing are obtained, giving the following colour shades Sulphanilic acid Red.

Aminoazobenzene sulphonic acid- Bordeaux red. 1 '-methyl- 3 -amino- 6-chlorbenzenel-sulphonic acid Brown-red. 1-aminonaphthalene-Z-sulphonic acid Blue-red.

If, instead of the 2-(dimethylaminoacetyD- arnino-8-hydroXy-naphthalene-fi-sulphonic acid the corresponding 3,6-disulphonic acid be employed, dyestuifs of similar shades and properties ,are obtained. By employing l-(dimethylamino- "acetyD -amino- 8 -hydroxynaphthalene- 3,6-disul phonic acid, yellower dyestuffs are in general obtained.

Example 4 Diazotized para-toluidine is coupled in the usual manner with '1-amino-2-methoxynaphthalene-fi-sulphonic acid in a solution rendered alkaline with sodium carbonate. 371 parts of the pure dyestuif (or a corresponding amount of the crude dyestuff) are treated in a solution, rendered alkaline with sodium carbonate, with 130 parts of chloracetyl chloride added a little at a time. The whole is stirred until the chloracetyl chloride has disappeared and the chloracetyl compound of the dyestuff is precipitated with acid. It is filtered off by suction and heated with 300 parts of a 30 per cent solution of dimethylamine until the reaction is completed. A dyestuif is obtained which dyes wool very uniform red shades which are fast to washing.

Example 5 35 parts of para-nitraniline are diazotized and coupled, in an acid medium, with 91 parts of 1- amino- 8 hydroxynaphthalene- 3,6 -disulphonic acid. The whole is then rendered alkaline by means of sodium carbonate and the diazo solution from 52 parts of meta-amino-omega-diethylaminophenetol is added thereto. The blue dyestufi obtained dyes wool even shades which are fast to washing.

Dyestuffs having similar properties are obtained by employing, instead of paranitraniline, ortho-nitraniline, para-nitro-ortho-ani idine, p-

chloraniline, 2,5-dichlorol-nitraniline, or instead of meta-amino-omega-diethylamino-phenetol the corresponding para-compound, or the p-amino ioenzyl-diethyl amine, or the 4-methyl-3-aminoj'phenyll-omega- (diethylamino) -ethyl sulphone described in Example 1, or the 4-methoxy-3- aminophenyl 1 omega-(dimethylamino) ethyl sulphone. Stronger dyeings of the blue dyestuffs obtained yield good, fast and even black shades.

Example 6 1 molecular proportion of diazotized aniline is coupled in the usual manner with 1 molecular proportion of the symmetric condensation product obtained by reacting 1 molecular proportion of phosgene with 2 molecular proportions of 2- amino-5-hydroxynaphthalene-'l sulphonic acid. The mono-azo dyestuff obtained is dissolved in sodium carbonate solution and the diazo solution from 1 molecular proportion of 4-methyl-3- aminophenyl-l- (omega-diethylamino) ethylsulphone is added thereto. A good substantive dyestuif is thus obtained which dyes cotton scarletred shades. This dyestuif may also be employed for dyeing viscose artificial silk. Similar dyestuffs which in part have bluer shades are obtained by employing, instead of the said sulphone, one of the diazotizable amines described in Example 1.

Example 7 A diazo solution prepared according to Example 1 from 270 parts of 4-methyl-3-amino-phenyl-l-omega(diethylamino)-ethy1 sulphone is introduced, while stirring, into a solution of 241 parts of 1-amino-2-methoxynaphthalene-6-sulphonic acid in sodium carbonate solution. The dyestuff obtained dyes wool very even blue-red shades having a good fastness to washing. By acetylating, a dyestuff is obtained which dyes wool yellower shades which have the same levelling power but are even faster to fulling. Excellent dyeings are likewise obtained by introducing into the dyestuff the radicle of dimethylaminoacetic acid in the manner described in Example 4.

Example 8 230 parts of 4-hydroxy-3-amino-1-(omega-diethylamino) -ethyl sulphone are diazotized in the presence of 350 parts of concentrated hydrochloric acid and 2000 parts of water with 69 parts of sodium nitrite. The diazo solution is added to 250 parts of the sodium salt of the Z-hydroxynaphthalene-S-sulphonic acid dissolved in sodium carbonate solution. The resulting dyestuir dyes wool orange-red shades. It may be treated, either on the fibre or in substance, with agents supplying chromium Bordeaux-red colorations being obtained. The dyeings are very uniform and fast to washing.

Example 9 388 parts of the potassium salt of 4-methyl- 3 amino-phenyl-l-omega-(diethylamino) ethyl sulphone-E-sulphonic acid are diazotized at 05 C. in the presence of 350 parts of concentrated hydrochloric acid and 1000 parts of water with 69- parts of sodium nitrite. The diazo solution is added, while stirring, to 192 parts of l-phenyl-3- methyl-5-pyrazolone and 270 parts of sodium carbonate dissolved in 2000 parts of water. The precipitation of the dyestuif is completed by the addition of common salt. The azo dyestuff thus obtained dyes wool uniform yellow shades of good fastness to washing.

If, instead of l-phenyl-3-methyl-5-pyrazolone, 2-hydroxy-naphthalene or 2-acetylamino-8-hydroxy-naphthalene-G-sulphonic acid be employed, dyestuffs of orange or red shades and similar valuable properties are obtained.

Example 10 3- (2',3-hydroxynaphthoyl) amino 4 methoxy-phenyl-l-omega (diethylaminoethyl) sulphone is prepared in known manner by treating 19 parts of 2-hydroxy-naphthalene-S-carboxylic acid with 27 parts of B-amino-l-methoxyphenyll-omega- (diethyl-amino ethyl) sulphone in the presence of phosphorus trichloride. 46 parts of the compound thus obtained are dissolved in parts of methanol under addition of 6 parts of potassium hydroxide. The methyl alcoholic solution is diluted with 300 parts of water and after addition of sodium carbonate the diazo solution of 24 parts of the sodium salt of l-aminobenzenel-sulphonic acid is added. An azo dyestuff is thus obtained which dyes wool Very uniform red shades of good fastness to washing.

Instead of the 3-(2',3'-hydroXynaphthoyl) aminol-methoxy-phenyl-1-omega -(diethy1aminoethy1)-su1phone there may be employed the 4- (2',3'-hydroxynaphthoyl) aminobenzyl-diethylamine as the coupling component.

Example 11 260 parts of -aminophenyl-l-omega-(diethylaminoethyl) sulphone are diazotized in the presence of 350 parts of concentrated hydrochloric acid and 1000 parts of water with 69 parts of sodium nitrite. pared is added to an aqueous solution, rendered alkaline with sodium carbonate of 430 parts of the sodium salt of 2-hydroxynaphthalene-6,8-disu1- phonic acid. An azo dyestuii is obtained which yields dyeings of orange shades and good fastness.

Example 12 The diazo solution thus premethyl-5-pyrazo1one yellow dyestufis are obtained, While if coupling with l-benzoyl-amino-B- hydroxynaphthalene-4,6-disulphonic acid a blue dyestufi is obtained. These dyestuffs yield dyeings of high levelling power and good fastness to washing.

Example 13 Example 14 208 parts of p-amino-omega-diethylaminophenetol are diazotized in the presence of 350 parts of concentrated hydrochloric acid and 1000 parts of water with 69 parts of sodium nitrite.

The diazo solution thus obtained is added to an aqueous solution, containing such an amount of sodium hydroxide to neutralize the hydrochloric acid, of 213 parts of the sodium salt of l-aminonaphthalene-'Y-sulphonic acid. The mono-azo dyestuff thus prepared is salted out, separated, dissolved again under the addition of acid and diazotized with sodium nitrite. The diazo solution thus obtained is added to an aqueous solu- 35.? tion, containing such an amount of sodium acetate to neutralize the acid, of 289 parts of the sodium salt of l-phenylaminonaphthalene-8-sulphonic acid. A disaz'o dyestufi is thus obtained which dyes wool beautiful blue shades of good 0' fastness to washing and fulling.

Instead of para-amino-omega-diethylaminophenetol other amines containing external basic groups may be employed. As amines of this kind there may be mentioned 4-aminobenzyldimethyl-amine, 3 amino 4 methylphenyl-lomega (dimethylaminoethyl) sulphone or 3 amino 4 methoxyphenyl 1 omega-(dimethylaminoethyl) -sulphone or the corresponding diethyl-compounds. Instead of l-amino naphthalene-V-sulphonic acid there may also be employed as the first coupling component l-aminonaphtha- 1ene-6-sulphonic acid or a mixture of these two acids. Instead of 1phenylamino-naphthalene-8- sulphonic acid there may be employed as the second coupling component the 1-(4'-methyl- 7c, diuin hydroxide.

phenyl) -aminonaphthalene-8-sulphonic acid.

If the amine used for the preparation of the diazo component already contains a sulphonic acid group l-amino-naphthalene may be employed as the first coupling component in this case.

Example 15 A diazo solution prepared in the usual manner from 159 parts of -aminobenzene-l-sulphonic acid is added to an aqueous solution of 338 parts of 2 amino 8 hydroxynaphthyl-G-omega-(diethylaminoethyl)-sulphone and 80 parts of so- The resulting dyestuff isv salted out, filtered oil by suction and dried. It dyes wool from an acid bath uniform red brown shades of good fastness to washing and fulling.

If the coupling process be performed in an acetic acid solution a dyestufi is obtained which dyes wool similar red brown shades of good fastness.

What we claim is: 1. Azo dyestufis corresponding to the general formula BN=N-Ar-X-N wherein Ar stands for an aromatic radical, the

group stands for a basic radical selected from the group consisting of NH2, primary and secondary alkyl, hydroxyalkyl, aralkyl and cycloalkyl amino groups and the radicals of hydrogenated heterocyclic nitrogen compounds including the N-atom, X stands for a chain containing carbon atoms, which is free from a basic action, and B stands for the radicle of an organic compound derived from the class consisting of aromatic compound and heterocyclic nitrogen compounds, and in which at least one of the radicles marked B and Ar contains a sulphonic acid group.

2. A20 dyestuffs corresponding to the general formula R1 B-N=NAr-XN where Ar stands for an aromatic radical, the

group stands for a basic radicalselected from the group consisting of -NH2, primary and secondary alkyl, hydroxyalkyl, aralkyl and cycloalkyl amino groups and the radicals of hydrogenated heterocyclic nitrogen compounds including the N-atom, X stands for a chain containing carbon atoms, which is free from a basic action, and B stands for the radicle of an aromatic compound substituted by at least one substituent selected from the amino and hydroxyl group, and in which at least one of the radicals marked B and Ar contains a sulphonic acid group.

3. A20 dyestuffs corresponding to the general formula wherein Ar stands for an aromatic radical, the group stands for a basic radical selected from the group consisting of NH2, primary and secondary alkyl, hydroxyalkyl, aralkyl and cycloalkyl .amino groups and the radicals of hydrogenated heterocyclic nitrogen compounds including the N-atom, X stands for a chain containing carbon atoms, which is free from a basic action, and B stands for a beta-naphthol sulphonic acid radicle.

GOL-

4. Azo dyestufis corresponding to the general formula stands for a basic radical selected from the group consisting of NI-I2, primary and secondary alkyl, hydroxyalkyl, aralkyl and cycloalkyl amino groups and the radicals of hydrogenated heterocyclic nitrogen compounds including the N-atom, X stands for a chain containing carbon atoms, which is free from a basic action, and Ar stands for an aromatic radical of the general formula:

wherein Y means a radicle capable of being coupled, B stands for the radicle of an organic compound derived from the class consisting of aromatic compounds and heterocyclic nitrogen compounds and in which .at least one of the radicles marked B and Ar contains a sulphonic acid group.

5. A20 dyestufis corresponding to the general formula R1 BN=NArX-N wherein the group stands for a basic radical selected from the group consisting of -NH2, primary and secondary alkyl, hydroxyalkyl, aralkyl and cycloalkyl amino groups and the radicals of hydrogenated heterocyclic nitrogen compounds including the N-atom, X stands for a chain containing carbon atoms, which is free from a basic action, and Ar stands for an aromatic radical of the general formula:

B stands for the radicle of an organic compound derived from the class consisting of aromatic compounds and heterocyclic nitrogen compounds and in which at least one of the radicles marked B and Ar contains a sulphonic acid group.

6. The azo dyestufi corresponding to the formula S0311 SOQH 7. The azo formula dyestuff corresponding to the 8. A20 dyestufis corresponding to the general formula:

wherein Ar stands for an aromatic radical, the

group 

